CN115808055A - Ferric phosphate integrated drying device, drying system and drying method - Google Patents

Abstract

The invention relates to the technical field of ferric phosphate drying, in particular to a ferric phosphate integrated drying device, a drying system and a drying method, wherein the drying device comprises: a tank body; the lower filter piece is provided with a through hole; a stirring member; the air inlet pipe assembly comprises an outer pipe body and an inner pipe body, the inner pipe body can be lifted, and the inner pipe body is provided with an air inlet; wherein, the inner pipe body has a first state, a second state and a third state. The drying system comprises an integrated drying device, a material collecting box, a rotary drying furnace, a solid-gas separation mechanism and a dehumidifier. According to the integrated drying device, the drying system and the drying method for the iron phosphate, the integrated cleaning, filter pressing and drying of the iron phosphate can be integrally completed, the drying and dehydration of the iron phosphate can be continuously completed by utilizing the cooperation of the rotary drying furnace, and the problems in the prior art are effectively solved.

Description

Integrated drying device, drying system and drying method for iron phosphate

Technical Field

The invention relates to the technical field of iron phosphate drying, in particular to an integrated drying device, a drying system and a drying method for iron phosphate.

Background

Iron phosphate is used as an important raw material of a new energy automobile battery, the demand gradually rises in recent years, and the requirement on the productivity of the iron phosphate is increased day by day, so that the requirement on the processing production efficiency of the iron phosphate is higher and higher. In the production and processing flow of the iron phosphate, the drying and dehydration of the iron phosphate are key links.

A conventional drying and dehydrating process of iron phosphate is as follows, and the iron phosphate after forming a raw material often contains impurities of an intermediate product. The raw materials are required to be filtered and washed, filter pressing is carried out through a plate-and-frame filter press and the like, filter cakes after filter pressing are subjected to flash evaporation through flash evaporation drying equipment, iron phosphate powder after flash evaporation drying enters a rotary kiln to be roasted and dehydrated, and finally, the sewage iron phosphate applied in a battery level is obtained. The existing process has the defects that the process flow is long, a plurality of devices such as washing and filtering devices, pressure filtration devices, crushing devices, flash evaporation devices and the like are required to be used, the washing and filtering and the pressure filtration devices are often required to be repeatedly carried out, and the efficiency is low.

Disclosure of Invention

The invention provides an integrated drying device, a drying system and a drying method for iron phosphate, which can integrally complete cleaning, filter pressing and drying of the iron phosphate, and can also utilize a rotary drying furnace to cooperate to continuously complete drying and dehydration of the iron phosphate, thereby effectively solving the problems in the prior art.

The technical scheme adopted by the invention for solving the technical problems is to provide an integrated drying device for iron phosphate, which comprises: the water-saving heating tank comprises a tank body, a heating device and a heating device, wherein the tank body is provided with an inner cavity, a water inlet part and an air exhaust part are arranged at the upper section in the tank body, a drain pipe capable of being opened and closed is arranged at the bottom of the tank body, and the tank body can be heated; the lower filter piece is arranged in the tank body and divides the tank body into an upper cavity and a lower cavity from top to bottom, the water inlet piece and the air exhaust piece are positioned in the upper cavity, the lower filter piece is provided with a through hole for communicating the upper cavity and the lower cavity, and the lower filter piece is provided with a water-proof connecting part at the edge of the through hole; the stirring piece is arranged on the upper cavity and comprises a stirring part; the air inlet pipe assembly comprises an outer pipe body and an inner pipe body arranged on the inner side of the outer pipe body, the inner pipe body is arranged in the through hole in a lifting mode and is provided with an air inlet hole, the upper end of the outer pipe body is connected to the connecting portion, and the bottom of the outer pipe body penetrates through the bottom of the tank body; the inner pipe body has a first state, when the inner pipe body is in the first state, the distance h1 between the top of the inner pipe body and the top surface of the lower filter element is smaller than a set value, and the inner pipe body closes the through hole; the inner pipe body has a second state, the distance h2 between the top of the inner pipe body and the top surface of the lower filter piece is larger than h1, so that the air inlet hole is communicated with the upper cavity; the inner pipe body has a third state, the top of the inner pipe body is contracted to the lower filter element, so that the through hole is communicated with the gap between the inner pipe body and the outer pipe body.

Further, the jar body still is equipped with at the epicoele and filters the piece, it includes the filter screen to filter the piece, the piece that takes out air set up in the filter screen upside.

Further, drying device still includes air pressure control mechanism, air pressure control mechanism sets up so, so that the atmospheric pressure of filter screen upside is less than when the filter screen downside space atmospheric pressure sets for the threshold value, air pressure control mechanism to filter screen upside space lets in atmospheric pressure.

Furthermore, the filter screen includes the elasticity skeleton, covers the filter screen body of elasticity skeleton, the elasticity skeleton is so set up, so that filter screen downside pressure is greater than during the pressure of filter screen upside, the elasticity skeleton drives the filter screen body is concave on, filter screen downside pressure is less than during the pressure of filter screen upside, the elasticity skeleton drives the filter screen body is protruding downwards.

Further, the jar body is in it is equipped with the support of swashing to filter the piece downside on, the support of swashing includes a plurality of edges the radial brace rod that sets up of jar body, the brace rod sets to the bow-shaped, so that the filter screen when protruding downwards with the brace rod butt.

Further, the air pressure control mechanism comprises a communicating pipe for communicating the upper side and the lower side of the filter screen, a piston block arranged in the communicating pipe, an elastic piece connected with the communicating pipe, a trigger switch and an air compensating valve arranged on the upper side of the filter screen; the air pressure on the upper side of the filter screen is smaller than the air pressure in the space on the lower side of the filter screen to set a threshold value, the piston block is pushed by a customer to overcome the elastic force of the elastic piece to move upwards to trigger the trigger switch, and the switch triggers and opens the air replenishing valve.

Furthermore, a vibrating piece is arranged in the inner pipe body.

Further, the inner pipe body is provided with at least two air inlet holes facing different directions, an inner air pipe is arranged in the inner pipe body, the inner air pipe extends to the top of the inner pipe body and is communicated with the inside of the air inlet pipe at the top of the inner pipe body; the inner pipe body is provided with an elastic sheet at the upper side part of the air inlet, the upper end of the elastic sheet is connected to the bottom wall of the inner pipe body, and the lower end of the elastic sheet is provided with a knocking hammer which can be magnetically connected with the inner gas pipe, and the inner pipe body is a non-magnetic suction inner pipe body.

The invention also provides an iron phosphate drying system, which comprises at least two iron phosphate integrated drying devices as described in any one of the above, and the drying system further comprises:

the material collecting box is used for receiving the raw materials discharged by the outer pipe body;

the feed inlet of the rotary drying furnace is communicated with the discharge outlet of the material collecting box, an air inlet is formed in one end of the feed inlet of the rotary drying furnace, and an air outlet is formed in one end of the discharge outlet of the rotary drying furnace;

the gas inlet end of the solid-gas separation mechanism is communicated with the gas outlet, and the gas outlet end of the solid-gas separation mechanism is communicated with the inner pipe body;

and the air inlet end of the dehumidifier is communicated with the air pumping part, and the air outlet end of the dehumidifier is communicated with the air inlet.

The invention also provides a method for drying the iron phosphate, which is based on the integrated iron phosphate drying device and comprises the following steps:

s1, adding raw materials into the tank body, wherein the inner pipe body is in a first state;

s2, injecting water into the tank body, and stirring and cleaning through a stirring piece;

s3, discharging water in the tank body, and executing the steps S2 and S3 at least twice;

s4, pressurizing the upper cavity, and press-filtering the material on the upper side of the lower filtering piece into a filter cake;

s5, moving the inner pipe body upwards to a second state, introducing nitrogen through the air inlet, heating the tank body, and exhausting air through the air exhaust port, wherein when the pressure difference on the filter screen exceeds a set threshold value, the nitrogen is introduced to the upper side of the filter screen, so that the filter screen is concave and deformed, and then the nitrogen is stopped to be introduced to the upper side of the filter screen;

s6, moving the inner pipe body to a first state, stirring and scattering the raw materials in the tank body through a stirring part of a stirring piece, and after stirring for a set time, executing S5 again;

s7, stopping introducing the nitrogen into the air inlet, moving the inner pipe body to a first state, and continuously exhausting air through the air exhaust hole;

s8, moving the inner pipe body to a third state, and discharging the raw materials out of the tank body.

The invention has the advantages that the cleaning, filter pressing and the drying of the iron phosphate can be integrally completed, and the drying and dehydration of the iron phosphate can be continuously completed by utilizing the cooperation of a rotary drying furnace, thereby effectively solving the problems in the prior art.

Drawings

Fig. 1 is a schematic structural diagram of an integrated drying apparatus according to an embodiment of the present invention.

Fig. 2 is a schematic view of the upper filter element in the canister of the embodiment of fig. 1.

FIG. 3 is a schematic structural diagram illustrating the position of the air inlet pipe assembly at the bottom of the tank in the embodiment shown in FIG. 1.

Fig. 4 is a side cross-sectional structural view of the embodiment shown in fig. 1.

Fig. 5 is a partially enlarged structural view of a portion a in fig. 4.

Fig. 6 is a schematic view of a part of the enlarged structure at B in fig. 4.

Fig. 7 is a schematic diagram of the circuit connection of the iron phosphate drying system according to an embodiment of the present invention.

In the figure, 1, a tank body; 2. an inner cavity; 3. a water inlet member; 4. an air extracting member; 5. a drain pipe; 6. a lower filter member; 601. a connecting portion; 7. a stirring member; 8. an air intake duct assembly; 801. an inner tube body; 802. an outer tube body; 803. an inner trachea; 804. an inner gas pipe spring plate; 805. knocking hammers; 9. a through hole; 10. an upper filter member; 1001. filtering with a screen; 10011. an elastic skeleton; 10012. a filter screen body; 11. an air pressure control mechanism; 1101. a communicating pipe; 1102. a piston block; 1103. an elastic member; 1104. a trigger switch; 1105. an air supply valve; 12. a sloshing support; 1201. supporting ribs; 13. an air inlet; 14. a material collecting box; 15. a rotary drying furnace; 1501. an air inlet; 1502. an air outlet; 16. a solid-gas separation mechanism; 17. a dehumidifier; 18. and (5) supplementing air pipes.

Detailed Description

In order to clearly explain the technical features of the present invention, the following detailed description of the present invention is provided with reference to the accompanying drawings.

As shown in fig. 1 to 6, an integrated drying apparatus for iron phosphate according to an embodiment of the present invention includes: the tank comprises a tank body 1, wherein the tank body 1 is provided with an inner cavity 2, a water inlet part 3 and an air exhaust part 4 are arranged at the upper section in the tank body 1, a water discharge pipe 5 capable of being opened and closed is arranged at the bottom of the tank body 1, and the tank body 1 can be heated; the down-filtering piece 6 is arranged in the tank body 1 and divides the tank body 1 into an upper chamber and a lower chamber from top to bottom, the water inlet piece 3 and the air exhaust piece 4 are positioned in the upper chamber, the down-filtering piece 6 is provided with a through hole 9 for communicating the upper chamber and the lower chamber, and the down-filtering piece 6 is provided with a water-proof connecting part 601 at the edge of the through hole 9; the stirring piece 7 is arranged on the upper cavity and comprises a stirring part; the air inlet pipe assembly 8 comprises an outer pipe body 802 and an inner pipe body 801 arranged on the inner side of the outer pipe body 802, the inner pipe body 801 is installed in the through hole 9 in a lifting mode, the inner pipe body 801 is provided with an air inlet hole 13, the upper end of the outer pipe body 802 is connected to the connecting portion 601, and the bottom of the outer pipe body 802 penetrates through the bottom of the tank body 1; wherein the inner tube 801 has a first state, when the inner tube 801 is in the first state, a distance h1 between a top of the inner tube 801 and a top surface of the bottom filter 6 is smaller than a set value, and the inner tube 801 closes the through hole 9; the inner pipe body 801 has a second state, the distance h2 between the top of the inner pipe body 801 and the top surface of the down-filter 6 is larger than h1, so that the air inlet hole 13 is communicated with the upper cavity; the inner tube 801 has a third state, and the top of the inner tube 801 is retracted to the lower filter 6, so that the through hole 9 communicates with the gap between the inner tube 801 and the outer tube 802.

The utility model provides an integrative drying device is when using, adds the raw materials in the epicoele of jar body 1, seals jar body 1 back, and the piece that washes by water to jar body 1 through intaking 3 carries out the raw materials washing, can stir the raw materials through stirring 7 in rinsing the filtration process to improve washing efficiency. After washing, the washing liquid is discharged from a drain pipe at the bottom of the tank body 1, and pressurized air is introduced into the tank body 1 to form filter pressing on the raw materials. After washing and filter pressing for at least one time, the tank body 1 is heated and dried, the inner pipe body 801 can be moved to a second state in the drying process, as shown in fig. 6, the air inlet 13 of the inner pipe body 801 can be communicated with the inside of the tank body 1, internal air is pumped out through the air pumping pipe, at the moment, air (preferably nitrogen with a certain temperature) is introduced into the tank body 1, through the combined action of the movement of the inner pipe body 801 and the air, the raw materials of filter cakes formed after filter pressing can be damaged, the evaporation area of the raw materials is increased, meanwhile, through the air flow, moisture of the filter cakes is taken away rapidly and is pumped out by the air pumping part 4, in the continuous drying process of the filter cakes, iron phosphate powder is continuously dropped off from the filter cakes under the action of air flow, the filter cakes can be gradually damaged, the evaporation area of the filter cakes is increased, and the drying efficiency is improved. After drying to a certain degree, the crushed filter cake can be stirred and crushed again by the stirring piece 7, and the crushing and drying of the raw material are further accelerated. Then, after the inner pipe 801 is moved to the third state, as shown in fig. 5, the crushed raw material is moved to between the outer pipe 802 and the inner pipe 801 through the through hole 9, and discharged outside the pot 1, and the discharged raw material may be dehydrated and dried in the roasting kiln.

When the integrated drying device is used, washing, filter pressing, crushing and drying can be completed in the tank body 1, and compared with the existing working procedures, equipment links and process flows are simplified; moreover, through the arrangement of the air inlet pipe assembly 8, the filter cake can be damaged on the basis of accelerating the drying of the filter cake through air conveying, so that the raw materials are conveniently discharged out of the tank body 1, and compared with a mode of opening the bottom of the tank body 1 to take out the filter cake, the operation steps are simplified, and the continuous production is favorably realized.

In the embodiment shown in fig. 1, h1 is set to zero, that is, when the inner tube 801 is in the first state, the top surface of the inner tube 801 is flush with the top surface of the lower filter member 6, so that the stirring member 7 can conveniently and fully stir the materials in the tank 1, and preferably, the top of the inner tube 801 can be leaked out of the top surface of the lower filter member 6 by a small distance, that is, smaller than a set value, which can meet the requirements of machining and assembling errors, lifting and moving control errors of the inner tube 801, and the like, and specifically, the set value can be 2cmm.

A further optimization of this application lies in that the jar body 1 still is equipped with at the epicoele and filters 10, it includes filter screen 1001 to go up to filter 10, the piece of taking out air 4 set up in filter screen 1001 upside. Through having set up and filtering piece 10, can be when pumping piece 4 outwards take out gas, filter the iron phosphate powder that the poplar played, when the more passage rate of filter screen 1001 adhesion iron phosphate powder is relatively poor, still can aerify the blowback to the upper side of filtering piece 10, blow off the iron phosphate powder of adhesion. In the embodiment shown in fig. 1, the suction member 4 comprises a suction tube, to which a suction pump can be connected to provide suction under negative pressure.

In the embodiment shown in fig. 1, it is further preferable that the drying device further includes an air pressure control mechanism 11, and the air pressure control mechanism 11 is configured such that when the air pressure on the upper side of the filter screen 1001 is smaller than the set threshold value of the air pressure in the space below the filter screen 1001, the air pressure control mechanism 11 supplies the air pressure to the space above the filter screen 1001. Through having set up air pressure control mechanism 11, including body 801 to jar internal in-process of ventilating, constantly outwards bleed through air exhaust piece 4, when filter screen 1001 adhesion iron phosphate powder is more, go up and filter piece 10 upper and lower both sides formation pressure differential, at this moment, can let in gas through the piece 10 upside of upwards filtering for the pressure of the piece 10 upside of going up filtering is greater than the pressure of the piece 10 downside of going up filtering, go down the iron phosphate powder blowback of filter screen 1001 table side adhesion, the realization is to the cleanness of the piece 10 of going up filtering.

The further optimization of above-mentioned embodiment lies in, filter screen 1001 includes elasticity skeleton 10011, covers elasticity skeleton 10011's filter screen body 10012, elasticity skeleton 10011 sets up like this, so that filter screen 1001 downside pressure is greater than during filter screen 1001 upside pressure, elasticity skeleton 10011 drives filter screen body 10012 is concave upward, filter screen 1001 downside pressure is less than during filter screen 1001 upside pressure, elasticity skeleton 10011 drives filter screen body 10012 is protruding downwards. Through having set up elastic framework 10011, as shown in fig. 4, with this in the in-process of ventilating in body 801 to jar body 1 including, constantly outwards bleed air through piece 4 of taking out air, when filter screen 1001 adhesion iron phosphate powder is more, both sides form pressure differential about going up filter piece 10, at this moment, filter screen 1001 is whole to be concave, can let in gas through going up filter piece 10 upside this moment, make the pressure of going up filter piece 10 upside be greater than the pressure of going up filter piece 10 downside, elastic framework 10011 drives filter screen body 10012 and descends downwards, go down the iron phosphate powder 1001 blowback of filter screen table side adhesion, realize the cleanness to last filter piece 10, in the deformation process about filter screen 1001, can drop after becoming flexible with the powder of the bonding blocking of table side, further improvement is to the clean effect of filter screen body 10012.

The elastic skeleton 10011 is preferably formed of a metal sheet, or a rubber elastic skeleton 10011.

In the embodiment shown in fig. 1, it is further optimized that the tank 1 is provided with a sloshing bracket 12 at the lower side of the upper filter element 10, the sloshing bracket 12 comprises a plurality of support ribs 1201 arranged along the radial direction of the tank 1, and the support ribs 1201 are arranged in an inverted arch shape so that the filter screen 1001 abuts against the support ribs 1201 when protruding downwards. As shown in fig. 4, through having set up and having swagged support 12, can be when filter screen body 10012 is moved by the concave downward convexity in the upper portion, can make filter screen body 10012 realize buckling deformation locally through swashing support 12, can get rid of the more stable powder vibration of filter screen 1001 table side adhesion, still can get rid of the powder through swashing support 12 and filter screen body 10012 table side contact friction, shaking to clear away the iron phosphate powder fast when filter screen body 10012 table side easy adhesion blocking under the wet environment in jar body 1. In the embodiment shown in fig. 1, the sloshing bracket 12 may be made of a metal material, such as the sloshing bracket 12.

As for the installation of the pneumatic control mechanism 11, more specifically, the pneumatic control mechanism 11 preferably includes a communication pipe 1101 that communicates the upper and lower sides of the strainer 1001, a piston block 1102 installed in the communication pipe 1101, an elastic member 1103 that connects the communication pipe 1101, a trigger switch 1104, and an aeration valve 1105 installed on the upper side of the strainer 1001; the air pressure on the upper side of the filter screen 1001 is smaller than the air pressure setting threshold value in the space below the filter screen 1001, the piston block 1102 is pushed by the elastic force of the elastic member 1103 to move upwards to trigger the trigger switch 1104, and the trigger switch opens the gulp valve 1105. As shown in fig. 4, by providing the piston block 1102, when the air pressure at the lower side of the upper filtering member 10 is greater than the air pressure at the lower side of the upper filtering member 10, the piston block 1102 is pushed upwards, after the filter screen body 10012 is adhered to the iron phosphate powder to a certain extent, resulting in the reduction of the passing capacity, so that the pressure difference between the two sides of the filter screen 1001 reaches a certain extent, at this time, the piston block 1102 overcomes the corresponding elastic force to move upwards, trigger the air replenishing valve 1105, so as to replenish the air at the upper side of the upper filtering member 10, so that the air pressure at the upper side of the upper filtering member 10 is higher than the air pressure at the lower side of the upper filtering member 10, so that the filter screen 1001 deforms in a downward convex manner.

The application sets up and filters 10 to will go up and filter 10 and the cooperation of air pressure control mechanism 11, so that including the in-process that the inlet port 13 of body 801 admits air, the exhaust tube bleeds, make filter screen 1001 can block the ferric phosphate powder of raising, still self-cleaning filter screen 1001, in order to maintain the stability that the air current flows. Through having set up filter screen 1001, can increase inlet port 13 atmospheric pressure and air current for the partial ferric phosphate powder in the jar body 1 is the state of flying upward, can improve the drying efficiency of ferric phosphate powder, still is favorable to ventilating through inlet port 13 and decomposes the ferric phosphate breakage after the filter-pressing.

In the embodiment shown in fig. 1, further specifically, the piston block 1102 is annular, the elastic member is a spring, the communication pipe 1101 is arranged in the middle of the upper section of the tank body 1, the piston block 1102 is installed in the communication pipe 1101, the middle section of the stirring shaft passes through the communication pipe and the piston block 1102, the installation cylinder is provided with a water through hole on the upper side of the upper filtering member 10, the spring and the trigger switch are installed in the installation cylinder, and the air supply valve 1105 can control the on-off of the air supply valve on the air supply pipe 18 in fig. 4, so as to realize the on-off of the air supply to the top of the tank body 1.

It should be noted that the piston block 1102 is not limited to the form shown in fig. 4, and as an equivalent embodiment, the piston block 1102 may be a single block-shaped piston block 1102, and a piston chamber for moving the piston block 1102 up and down is provided on the wall of the filter or tank 1.

In the technical solution of the present invention, a further optimization is that a vibrating piece is arranged in the inner tube 801. By arranging the vibrating piece on the inner pipe body 801, the inner pipe body 801 can be upwards extended to the second state to vibrate the inner pipe body 801, so that the inner pipe body 801 can be accelerated to vibrate and break ferric phosphate in a filter cake shape, particularly after the filter cake is decomposed and leans against the inner pipe body 801 backwards, the ferric phosphate at the edge of the filter cake block is broken and decomposed continuously through the vibration of the inner pipe body 801, and the decomposed ferric phosphate block is blown and decomposed again along the surface side of the inner pipe body 801 by gas introduced from the pipe body gas inlet hole 13. Further improving the decomposition efficiency. In addition, the vibrating piece can also vibrate the iron phosphate at the position of the air inlet 13 of the inner pipe body 801 to be loose, so that the internal air can blow the loose iron phosphate, and the iron phosphate can be prevented from blocking the air inlet 13.

In the embodiment shown in fig. 4, in order to improve the drying efficiency and facilitate discharging of the iron phosphate through the through hole 9, in the embodiment shown in fig. 4, as shown in fig. 3, the adult of the down-filter 6 is arranged in an inverted circular truncated cone shape, the down-filter 6 includes a bottom bracket and a filter layer disposed on the upper side of the bottom bracket, the bottom bracket forms a connecting portion 601, an air inlet pipe assembly 8 is disposed in the middle of the down-filter 6, the bottom bracket is provided with at least one mounting ring, the mounting ring is provided with the connecting portion 601, so that the air inlet pipe assembly 8 is provided with a plurality of air outlet regions in the position of the down-filter 6, the raising effect on the iron phosphate powder is enhanced, and the disintegrated filter cake blocks can obliquely move downwards towards the middle of the inner pipe 6, so as to increase the contact probability between the inner pipe body 801 and the filter cake blocks, and improve the vibration and crushing effect of the filter cake blocks by the filter body 801. Simultaneously, still when the discharge iron phosphate powder, utilize a plurality of through-holes 9 to arrange the material simultaneously, do benefit to quick row material, moreover, through-hole 9 at middle part can furthest with inside iron phosphate powder discharge.

With regard to the arrangement of the present invention, it is further optimized that the inner tube 801 is provided with at least two differently oriented air inlet holes 13, an inner air pipe 803 is arranged in the inner tube 801, the inner air pipe 803 extends to the top of the inner tube 801 and is communicated with the inside of the inner tube at the top of the inner tube 801;

an inner air pipe elastic sheet 804 is arranged on the upper side portion of the air inlet hole 13 of the inner pipe body 801, the upper end of the inner air pipe elastic sheet 804 is connected to the bottom wall of the inner pipe body 801, a knocking hammer 805 is arranged at the lower end of the inner air pipe elastic sheet 804, the knocking hammer 805 can be magnetically connected with the inner air pipe 803, and the inner pipe body 801 is a non-magnetic inner pipe body 801. As shown in fig. 5 and fig. 6, by such an arrangement, when gas is introduced into the inner gas pipe 803, the gas flows into the inner pipe 801 through the inner gas pipe 803, and then pushes the inner gas pipe elastic sheet 804 to swing towards the side wall of the inner pipe 801, and the knocking hammer 805 can knock the inner pipe 801 to realize vibration of the inner pipe 801, so that on one hand, a filter cake block contacting the inner pipe 801 can be vibrated and decomposed, and on the other hand, iron phosphate adhered to the surface side of the inner pipe 801 can be vibrated and shaken off. When the air flow in the inner pipe body 801 is interrupted, the knocking hammer 805 and the inner air pipe 803 are in magnetic attraction connection and reset under the action of the magnetic attraction force. Repeated knocking of the inner pipe 801 by the knocking hammer 805 can be achieved by pulsed air supply to the inner pipe 803.

In addition, in the embodiment shown in fig. 1, when discharging the iron phosphate powder, the inner pipe 801 of the through hole 9 of the outer ring may be adjusted to the first state, and the iron phosphate powder is accelerated to be gathered to the middle part and discharged by the vibration of the inner pipe 801.

As for the arrangement of the vibrating member, as a preferable feasible embodiment, an electrodynamic vibrating member alone may be further adopted to be arranged in the inner tube body 801.

In the embodiment shown in fig. 1, the heating method of the tank 1 is not limited, and preferably, the tank 1 may adopt an electric heating tank 1, or the tank 1 adopts a sandwich tank 1, and a high-temperature fluid is introduced into the side wall of the tank 1 to heat, or a combustion heating method is adopted to heat the tank 1.

To stirring member 7, in an embodiment shown in fig. 1, stirring member 7 includes the stirring shaft that stretches into jar body 1, the stirring portion is installed to the stirring shaft, stirring portion is for setting up the blade at the stirring shaft lower extreme, the blade bottom is equipped with broken tooth, the stirring shaft sets to scalable to when needs stir the raw materials, stretch into the raw materials downside with the blade and stir, when needs filter-pressing or interior body 801 extension carry out the drying breakage to the filter cake, the space of (mixing) shaft lift on the raw materials upside. When discharging the iron phosphate powder, the stirring member 7 may be extended downward to wave the iron phosphate powder, so as to facilitate the discharge. The arrangement of the stirring member 7 is not limited to the form shown in fig. 4, and in alternative embodiments, other configurations may be adopted, for example, the stirring shaft extends from the bottom of the tank 1, or the stirring member 7 is stirred by vibration.

In the embodiment shown in fig. 4, the inner pipe 801 is lifted, a hydraulic telescopic rod is arranged at the bottom of the inner pipe 801, a collecting hopper is arranged at the bottom of the tank body 1, and the hydraulic telescopic rod penetrates through the collecting hopper and then is fixed at the lower side of the collecting hopper.

It should be noted that, as to the pressure filtration pressurization of the raw material in the tank in the embodiment of the present invention, preferably, in the example shown in fig. 4, the inside of the tank may be pressurized by an air supply pipe 18, and a pressurization pump may be further provided in the air supply pipe; or the air exhaust pipe is connected with a pressurizing branch, and a pressurizing pump is arranged on the pressurizing branch to pressurize the tank body through the air exhaust pipe.

The invention also provides an iron phosphate drying system which comprises at least two iron phosphate integrated drying devices in any one of the embodiments, and a material collecting box 14 for receiving the raw materials discharged by the outer pipe body; a feed inlet of the rotary drying furnace 15 is communicated with a discharge outlet of the material collecting box 14, an air inlet 1501 is formed in one end of the feed inlet of the rotary drying furnace 15, and an air outlet 1502 is formed in one end of the discharge outlet of the rotary drying furnace 15; a solid-gas separation mechanism 16, wherein a gas inlet end of the solid-gas separation mechanism 16 is communicated with the gas outlet 1502, and a gas outlet end of the solid-gas separation mechanism 16 is communicated with the inner pipe 801; and the air inlet end of the dehumidifier 17 is communicated with the air pumping part 4, and the air outlet end of the dehumidifier 17 is communicated with the air inlet 1501.

As shown in fig. 7, when the ferric phosphate is dried and dehydrated, the raw material dried by the drying device enters the material collection box 14, the raw material in the material collection box 14 enters the rotary drying furnace 15, and is subjected to rotary roasting dehydration, wherein the hot gas at a higher temperature led out from the rotary drying furnace 15 passes through the solid-gas separation mechanism 16 to separate powder impurities and part of liquid water droplets in the gas, the gas at the time is still kept at a higher temperature, the part of gas is introduced into the tank body 1 through the inner pipe 801, the filter cake can be disintegrated and dried by using high-temperature gas, the evaporation of water in the filter cake can be accelerated by using the gas at the higher temperature, and especially the powdered ferric phosphate can be driven to be rapidly dried, so that the ferric phosphate in the tank body 1 enters a flying state, the filter cake can be rapidly decomposed and crushed, the waste heat of the tail gas of the rotary drying furnace 15 can be directly utilized, and the decomposition and crushing of the filter cake in the tank body 1 can be accelerated. After the filter cake is decomposed and crushed, the raw materials in the tank body 1 can be further decomposed and crushed by the stirring piece 7, and simultaneously, the raw materials are further dried by heating the tank body 1. The gas discharged from the gas pumping part 4 enters a dehumidifier 17, and the gas with the reduced water content enters the rotary drying furnace 15 again to dry the iron phosphate.

By providing at least two drying devices, the time intervals between the discharge of the drying devices can be minimized, so that continuous operation of the rotary drying oven 15 can be achieved.

For the specific implementation of the present invention, the solid-gas separation mechanism 16 may preferably be a cyclone dust collector or a membrane bag dust collector, and the membrane bag dust collector may be a metal membrane bag to adapt to the high-temperature gas to be led out. The dehumidifier 17 may be a condensate dehydrator.

The invention also provides a drying method of the iron phosphate, which is based on the integrated drying device of the iron phosphate, and the drying method comprises the following steps:

s1, adding raw materials into the tank body 1, wherein an inner pipe body 801 is in a first state;

s2, injecting water into the tank body 1, and stirring and cleaning through a stirring piece 7;

s3, discharging water in the tank body 1, and executing S2 and S3 at least twice;

s4, pressurizing the upper cavity, and press-filtering the material on the upper side of the lower filtering piece 6 to form a filter cake;

s5, moving the inner pipe body 801 upwards to a second state, introducing nitrogen through the air inlet 1501, heating the tank body 1, and exhausting air through the air exhaust opening, wherein when the pressure difference on the filter screen 1001 exceeds a set threshold value, introducing nitrogen to the upper side of the filter screen 1001 to enable the filter screen 1001 to be concave and deformed, and then stopping introducing nitrogen to the upper side of the filter screen 1001;

preferably, nitrogen is used to maintain the environment of the raw material during drying, and in an embodiment of the present invention, after the raw material discharged from the outer tube 802 is discharged, the raw material is fed into the rotary drying furnace 15 to be baked and dried, and in this process, high temperature nitrogen is fed into the rotary drying furnace 15, and after the high temperature nitrogen is discharged, the high temperature nitrogen is fed into the inner tube 801 and the upper side of the filter screen 1001 to decompose and dry the raw material filter cake in the tank 1.

S6, moving the inner pipe 801 to a first state, stirring and scattering the raw materials in the tank body 1 through the stirring part of the stirring piece 7, and after stirring for a set time, executing S5 again;

after preliminary dry decomposition is carried out to the filter cake through letting in high temperature nitrogen gas with this, further broken decomposition of material of filter cake through stirring piece 7 to increase the evaporation drying area of the iron phosphate in the jar body 1, still can increase the mobility of the iron phosphate raw materials in the jar body 1, convenient follow-up discharge the iron phosphate. After the cake pieces not blown off by the aeration of S5 in the tank 1 are further crushed by the stirrer 7, S5 is performed again, and the aeration is performed again through the inner pipe 801 to further crush and dry the raw material in the tank 1.

S7, stopping introducing nitrogen into the gas inlet 1501, moving the inner pipe body 801 to the first state, and continuously exhausting gas through the exhaust holes;

after the inner pipe 801 is moved to the first state, the air exhaust holes continuously exhaust air, the tank body 1 continuously heats, at the moment, the iron phosphate raw material in the powder state in the tank body 1 can be further subjected to vacuum drying, and the drying degree is further improved. Moreover, the raw materials can be continuously stirred by the stirring piece 7 in the process, so that the vacuum drying efficiency is improved.

Through carrying out above-mentioned step, can be through the supplementary dry filter cake of gas that the gas pocket lets in, carry out the breakage to the filter cake, especially can use the high temperature nitrogen gas of drawing forth in the rotary drying furnace 15, owing to can be through the evacuation drying after decomposing the filter cake breakage, draw forth and let in and contain partial moisture in the nitrogen gas and also can not influence jar body 1 in to the dry and broken effect of filter cake, can directly utilize the gas that rotary drying furnace 15 draws forth, waste heat utilization efficiency is higher.

S8, moving the inner pipe body 801 to a third state, and discharging the raw materials out of the tank body 1.

It should be noted that in order to better show the specific structure, the structural deletion and differentiation are made in the partial illustration, specifically, in fig. 2, only the top section of the tank and the bottom view of the top filter are drawn, in fig. 3, the tank features and the filter layer of the bottom filter are removed, in fig. 4, in order to show the different states of the inner tube, wherein the three inner tubes shown in the cross section are in different states, and the iron phosphate powder is added to indicate that the right-most inner tube is in the third state.

The above-described embodiments should not be construed as limiting the scope of the invention, and any alternative modifications or alterations to the embodiments of the present invention will be apparent to those skilled in the art.

The details of the present invention are not described in detail, but are known to those skilled in the art.

Claims (10)

1. The utility model provides an integrative drying device of ferric phosphate which characterized in that includes:

the water-saving tank comprises a tank body, a water inlet part and an air exhaust part are arranged at the upper section in the tank body, a drain pipe capable of being opened and closed is arranged at the bottom of the tank body, and the tank body can be heated;

the lower filter piece is arranged in the tank body and divides the tank body into an upper cavity and a lower cavity from top to bottom, the water inlet piece and the air exhaust piece are positioned in the upper cavity, the lower filter piece is provided with a through hole for communicating the upper cavity and the lower cavity, and the lower filter piece is provided with a water-proof connecting part at the edge of the through hole;

the stirring piece is arranged on the upper cavity and comprises a stirring part;

the air inlet pipe assembly comprises an outer pipe body and an inner pipe body arranged on the inner side of the outer pipe body, the inner pipe body is arranged in the through hole in a lifting mode and is provided with an air inlet hole, the upper end of the outer pipe body is connected to the connecting portion, and the bottom of the outer pipe body penetrates through the bottom of the tank body;

the inner pipe body has a first state, when the inner pipe body is in the first state, the distance h1 between the top of the inner pipe body and the top surface of the lower filter element is smaller than a set value, and the inner pipe body closes the through hole;

the inner pipe body has a second state, the distance h2 between the top of the inner pipe body and the top surface of the lower filter piece is larger than h1, so that the air inlet hole is communicated with the upper cavity;

the inner pipe body has a third state, the top of the inner pipe body is contracted to the lower filter element, so that the through hole is communicated with the gap between the inner pipe body and the outer pipe body.

2. The integrated drying device for iron phosphate according to claim 1, characterized in that: the jar body still is equipped with at the epicoele and filters the piece, it includes the filter screen to filter the piece, the piece that takes out air set up in the filter screen upside.

3. The integrated drying device for iron phosphate according to claim 2, characterized in that: drying device still includes air pressure control mechanism, air pressure control mechanism sets up so, so that the atmospheric pressure of filter screen upside is less than when the filter screen downside space atmospheric pressure sets for the threshold value, air pressure control mechanism to filter screen upside space lets in atmospheric pressure.

4. The integrated drying device for iron phosphate according to claim 3, characterized in that: the filter screen includes the elasticity skeleton, covers the filter screen body of elasticity skeleton, the elasticity skeleton is so set up, so that filter screen downside pressure is greater than during the filter screen upside pressure, the elasticity skeleton drives filter screen body is last concave, filter screen downside pressure is less than during the filter screen upside pressure, the elasticity skeleton drives filter screen body is protruding down.

5. The integrated drying device for iron phosphate according to claim 4, characterized in that: the jar body is in it is equipped with the support of swashing to filter the piece downside on, the support of swashing includes a plurality of edges the radial brace rod that sets up of jar body, the brace rod sets to the anti-bow-shaped to make the filter screen down during protruding with the brace rod butt.

6. The integrated drying device for iron phosphate according to claim 3, characterized in that: the air pressure control mechanism comprises a communicating pipe communicated with the upper side and the lower side of the filter screen, a piston block arranged in the communicating pipe, an elastic piece connected with the communicating pipe, a trigger switch and an aeration valve arranged on the upper side of the filter screen;

the air pressure on the upper side of the filter screen is smaller than the air pressure in the space on the lower side of the filter screen to set a threshold value, the piston block is pushed by a customer to overcome the elastic force of the elastic piece to move upwards to trigger the trigger switch, and the trigger switch opens the air replenishing valve.

7. The integrated drying device for iron phosphate according to claim 1, characterized in that: the inner tube body is internally provided with a vibrating piece.

8. The integrated drying apparatus for iron phosphate according to claim 1 or 7, characterized in that: the inner pipe body is at least provided with two air inlet holes facing different directions, an inner air pipe is arranged in the inner pipe body, the inner air pipe extends to the top of the inner pipe body and is communicated with the inside of the inner pipe body at the top of the inner pipe body;

the inner pipe body is provided with an elastic sheet at the upper side part of the air inlet, the upper end of the elastic sheet is connected to the bottom wall of the inner pipe body, the lower end of the elastic sheet is provided with a knocking hammer, the knocking hammer can be in magnetic attraction connection with the inner air pipe, and the inner pipe body is a non-magnetic attraction inner pipe body.

9. An iron phosphate drying system which characterized in that: comprising at least two iron phosphate integral drying apparatuses according to any one of claims 1 to 8, said drying system further comprising:

the material collecting box is used for receiving the raw materials discharged by the outer pipe body;

the feed inlet of the rotary drying furnace is communicated with the discharge outlet of the material collecting box, an air inlet is formed in one end of the feed inlet of the rotary drying furnace, and an air outlet is formed in one end of the discharge outlet of the rotary drying furnace;

the gas inlet end of the solid-gas separation mechanism is communicated with the gas outlet, and the gas outlet end of the solid-gas separation mechanism is communicated with the inner pipe body;

and the air inlet end of the dehumidifier is communicated with the air pumping part, and the air outlet end of the dehumidifier is communicated with the air inlet.

10. A method for drying ferric phosphate is characterized by comprising the following steps: the integrated drying device for iron phosphate according to any one of claims 2 to 5, wherein the drying method comprises:

s1, adding raw materials into the tank body, wherein the inner pipe body is in a first state;

s2, injecting water into the tank body, and stirring and cleaning through a stirring piece;

s3, discharging water in the tank body, and executing S2 and S3 at least twice;

s4, pressurizing the upper cavity, and press-filtering the material on the upper side of the lower filtering piece into a filter cake;

s5, moving the inner pipe body upwards to a second state, introducing nitrogen through the air inlet, heating the tank body, and exhausting air through the air exhaust port, wherein when the pressure difference on the filter screen exceeds a set threshold value, the nitrogen is introduced to the upper side of the filter screen, so that the filter screen is concave and deformed, and then the nitrogen is stopped to be introduced to the upper side of the filter screen;

s6, moving the inner pipe body to a first state, stirring and scattering the raw materials in the tank body through a stirring part of a stirring piece, and after stirring for a set time, executing S5 again;

s7, stopping introducing nitrogen into the air inlet, moving the inner pipe body to a first state, and continuously exhausting air through the air exhaust hole;

s8, moving the inner pipe body to a third state, and discharging the raw materials out of the tank body.

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